CA2146944A1 - Method for preventing yellowing of lignocellulosic products - Google Patents

Method for preventing yellowing of lignocellulosic products

Info

Publication number
CA2146944A1
CA2146944A1 CA002146944A CA2146944A CA2146944A1 CA 2146944 A1 CA2146944 A1 CA 2146944A1 CA 002146944 A CA002146944 A CA 002146944A CA 2146944 A CA2146944 A CA 2146944A CA 2146944 A1 CA2146944 A1 CA 2146944A1
Authority
CA
Canada
Prior art keywords
lignocellulosic
pthf
pulp
preventing yellowing
lignocellulosic products
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002146944A
Other languages
French (fr)
Other versions
CA2146944C (en
Inventor
Jan Janson
Ingegerd Forsskahl
Taina Korhonen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KESKUSLABORATORIO - CENTRALLABORATORIUM Oy AB
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2146944A1 publication Critical patent/CA2146944A1/en
Application granted granted Critical
Publication of CA2146944C publication Critical patent/CA2146944C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/53—Polyethers; Polyesters
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/143—Agents preventing ageing of paper, e.g. radiation absorbing substances

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention relates to a method for protecting lignocellulosic material against yellowing caused by light or heat. The invention further concerns brightness stabilizing compositions intended for treatment of lignocellulosic materials. According to the invention, polytetrahydrofuran (PTHF) is used as the brightness stabilizing agent.
Preferably PTHF having a molar mass of about 150 to 1500 is used. The invention provides a good stabilization of lignocellulosic pulp and of products containing such pulp, whereby the amount of PTHF required can be extremely small, e.g., 0,05 - 5 % of the weight of the material.
CA002146944A 1994-04-20 1995-04-12 Method for preventing yellowing of lignocellulosic products Expired - Fee Related CA2146944C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI941815A FI94973C (en) 1994-04-20 1994-04-20 Ways of counteracting yellowing of lignocellulosic products
FI941815 1994-04-20

Publications (2)

Publication Number Publication Date
CA2146944A1 true CA2146944A1 (en) 1995-10-21
CA2146944C CA2146944C (en) 2005-12-06

Family

ID=8540559

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002146944A Expired - Fee Related CA2146944C (en) 1994-04-20 1995-04-12 Method for preventing yellowing of lignocellulosic products

Country Status (6)

Country Link
US (1) US5658431A (en)
CA (1) CA2146944C (en)
DE (1) DE19513578A1 (en)
FI (1) FI94973C (en)
FR (1) FR2719060B1 (en)
SE (1) SE513467C2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5928473A (en) * 1997-01-15 1999-07-27 University Of Ottawa Inhibition of photo-yellowing in paper
KR100551918B1 (en) 1997-07-23 2006-02-16 시바 스폐셜티 케미칼스 홀딩 인코포레이티드 A hindered amine compound, a composition comprising the same and a process for preventing the loss of brightness and for enhancing resistance to yellowing of pulp or paper by using the same
US6447644B1 (en) 1997-07-23 2002-09-10 Ciba Specialty Chemicals Corporation Inhibition of pulp and paper yellowing using nitroxides, hydroxylamines and other coadditives
WO2001012728A1 (en) * 1999-08-13 2001-02-22 Basf Aktiengesellschaft Colorant preparations
US6527914B1 (en) * 2002-01-30 2003-03-04 Ondeo Nalco Company Method of enhancing brightness and brightness stability of paper made with mechanical pulp

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE322412B (en) * 1968-09-10 1970-04-06 Mo Och Domsjoe Ab
CA1098633A (en) * 1978-12-14 1981-03-31 Elsa S. Polatajko-Lobos Paper coating composition

Also Published As

Publication number Publication date
SE9501410L (en) 1995-10-21
DE19513578A1 (en) 1995-10-26
FR2719060B1 (en) 1999-11-12
CA2146944C (en) 2005-12-06
FR2719060A1 (en) 1995-10-27
SE513467C2 (en) 2000-09-18
FI941815A0 (en) 1994-04-20
FI94973C (en) 1995-11-27
US5658431A (en) 1997-08-19
SE9501410D0 (en) 1995-04-18
FI94973B (en) 1995-08-15

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed